When it comes to home lighting, one question I receive often is **how many lights can be on a 15 amp circuit breaker**.

The number of fixtures that can be on a 15-amp circuit depends on the wattage of the bulbs, and the lighting load should not exceed 80% of the breaker rating.

If you plan to add more bulbs to your circuits, make sure it is within the safe level to avoid overloading the breaker.

**Contents**hide

**How to calculate the number of light fixtures that can be on a 15 amp circuit breaker.**

In order to get a specific number of lights to be on a 15 amp circuit, you must follow the NEC 80% breaker rating rule.

The law states that you should not continuously load electrical circuits more than 80% of their maximum rated capacity.

So to get the number of light fixtures to put on a 15 A breaker, apply the NEC rule by multiplying 15 amp with 80% or 0.8.

That is 15 amps x 0.8 = 12 amps.

Then you convert the amperage to watts. If the line voltage is 120v, you convert it to watts by multiplying 12 amps with 120 volts.

12 A X120 V = 1440watts.

If you are to put 100-watt incandescent lights on a 15 amp breaker, it can safely accommodate 14 bulbs.

that is 1140w / 100w = 14.4 or 14 bulbs.

**Calculating the number of fluorescent or incandescent bulbs to put on a 15 amp breaker**

If you are to calculate the number of bulbs to be on a single circuit be it fluorescent or incandescent, all you have to do is to divide 1440w with the wattage of the light bulb.

Example: **How many 200 w incandescent bulbs can be on one 15-amp circuit breaker?**

The maximum number of 200 w bulbs to be on the circuit will be 1440 watts divided by 200 w = 7 bulbs.

You can also use the same step to get the number of fluorescent bulbs.

**Calculating the number of led or recessed lights to be on a 15-amp circuit**

LED bulbs use less energy to produce bright lumen. A 10 watts led bulb can produce a light strength equivalent to 100 w traditional bulb.

If you are to calculate the number 10 w led bulb to be on the 15A circuit, the result will be 1440 / 10 = 144 led bulbs.

Though you cannot install all these light bulbs at home, you can see how much energy you can save by replacing incandescent lighting with LED bulbs.

**Effects of installing too many lights on a circuit**

Installing too many lights and outlets on a single circuit leads to severe electrical hazards such as

**Overheating: **When too much current flows through a circuit, the wires and components become very hot. This can melt wire insulators, leading to short circuits and electrical fires.

**Frequent tripping of the breaker: **Circuit breakers are designed to protect the circuits from overloads. So each time they detect excessive currents, they trip the breaker.

**Damage to electrical appliances**

When too many lights or appliances are on one circuit, they may cause electrical surge and damage to electrical devices.

**Increase in electricity bill**

Overloaded circuits often draw more power than required thereby increasing the energy bills.

**Conclusion**

From this article, you can see that it is simple to figure out how many lights you can run on a 15 A circuit.

However, you should be careful while converting amps to watts to avoid mistakes.

Should in case you are in doubt about the conversion, contact a qualified electrician to help you.

**Related articles**

- Dimmable LED Flash: How to Fix a Flickering Light Bulb
- Electrical Testing for Home, Industrial and Commercial Buildings
- Water Heater Keeps Tripping the Circuit Breaker: Here are the Major Causes and How to Fix It
- How to wire a Circuit Breaker Box
- Microwaves Tripping the Circuit Breaker: Causes & How to Fix It.
- 30 Amp Breaker From Square D. Its Uses and How to Install them.
- 20 amp breaker overview
- Doorbell Wiring Diagrams: Learn How to install a doorbell Transformer, Chime, and Push Button
- 60 Amp Wire Size: Breaker Wire Sizing Guide
- GFCI Outlet Won’t reset, 7 Causes and How to Fix it.
- Sulfur hexafluoride (SF6) Circuit Breaker Explained: Types & How It Works